Synthesis and Evaluation of Antibacterial Activity of Bottromycins
Takeshi Yamada, Miu Yagita, Yutaka Kobayashi, Goh Sennari, Hiroyuki Shimamura, Hidehito Matsui, Yuki Horimatsu, Hideaki Hanaki, Tomoyasu Hirose, Satoshi O̅mura, Toshiaki Sunazuka
Index: 10.1021/acs.joc.8b00045
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Abstract
Total synthesis of bottromycin A2 can be accomplished through a diastereoselective Mannich reaction of a chiral sulfinamide, mercury-mediated intermolecular amidination, and cyclization of a constrained tetracyclic peptide. Exploitation of this process allowed the synthesis of several novel bottromycin analogs. The antimicrobial activity of these analogs was evaluated in vitro against Gram-positive bacteria, such as methicillin resistant Staphylococcus aureus (MRSA) and vancomycin resistant enterococci (VRE). Structure–activity relationships were explored taking into consideration the unique three-dimensional structure of the compounds. Notably, one of the new analogs devoid of a methyl ester, which is known to lower the in vivo efficacy of bottromycin, exhibited antibacterial bioactivity comparable to that of vancomycin.